A component licensed under LGPL can be used by closed source, proprietary software, both internally used and distributed, for free, with no effects on the software using the component. LGPL is not “contagious” in the same way as GPL, so it only affects the component under LGPL. As long as you’re only using official distributions of the component, it is free to use and free to redistribute. The only requirement is that you include a notice in your “about” page or similar that the component is used. 

<?xml version="1.0" encoding="utf-8"?>
<license id="17d46246-a6cb-4196-98a0-ff6fc08cb67f" expiration="2012-06-12T00:00:00.0000000" type="Trial" prof="EFProf">
  <name>MyName</name>
  <Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
    <SignedInfo>
      <CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" />
      <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
      <Reference URI="">
        <Transforms>
          <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
        </Transforms>
        <DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
        <DigestValue>b8N0bDE4gTakfdGKtzDflmmyyXI=</DigestValue>
      </Reference>
    </SignedInfo>
    <SignatureValue>IPELgc9BbkD8smXSe0sGqp5vS57CtZo9ME2ZfXSq/thVu...=</SignatureValue>
  </Signature>
</license>

        public static string CreateRSAKeyPair(int dwKeySize = 1024)
        {
            using (var provider = new RSACryptoServiceProvider(dwKeySize))
            {
                return provider.ToXmlString(includePrivateParameters: true);
            }
        }

namespace SignedXmlSample
{
    public enum LicenseType
    {
        None,
        Trial,
        Standard,
        Personal
    }
}

using System;
using System.Xml.Serialization;

namespace SignedXmlSample
{
    public class License
    {
        [XmlAttribute]
        public Guid Id { set; get; }
        
        public string Domain { set; get; }

        [XmlAttribute]
        public string IssuedTo { set; get; }

        [XmlAttribute]
        public DateTime Expiration { set; get; }

        [XmlAttribute]
        public LicenseType Type { set; get; }
    }
}

using System;
using System.IO;
using System.Security.Cryptography; // needs a ref. to `System.Security.dll` asm.
using System.Security.Cryptography.Xml;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

namespace SignedXmlSample
{
    public static class LicenseGenerator
    {
        public static string CreateLicense(string licensePrivateKey, License licenseData)
        {
            using (var provider = new RSACryptoServiceProvider())
            {
                provider.FromXmlString(licensePrivateKey);
                var xmlDocument = createXmlDocument(licenseData);
                var xmlDigitalSignature = getXmlDigitalSignature(xmlDocument, provider);
                appendDigitalSignature(xmlDocument, xmlDigitalSignature);
                return xmlDocumentToString(xmlDocument);
            }
        }

        public static string CreateRSAKeyPair(int dwKeySize = 1024)
        {
            using (var provider = new RSACryptoServiceProvider(dwKeySize))
            {
                return provider.ToXmlString(includePrivateParameters: true);
            }
        }

        public static License ReadLicense(string licensePublicKey, string xmlFileContent)
        {
            var doc = new XmlDocument();
            doc.LoadXml(xmlFileContent);

            using (var provider = new RSACryptoServiceProvider())
            {
                provider.FromXmlString(licensePublicKey);

                var nsmgr = new XmlNamespaceManager(doc.NameTable);
                nsmgr.AddNamespace("sig", "http://www.w3.org/2000/09/xmldsig#");

                var xml = new SignedXml(doc);
                var signatureNode = (XmlElement)doc.SelectSingleNode("//sig:Signature", nsmgr);
                if (signatureNode == null)
                    throw new InvalidOperationException("This license file is not signed.");

                xml.LoadXml(signatureNode);
                if (!xml.CheckSignature(provider))
                    throw new InvalidOperationException("This license file is not valid.");

                var ourXml = xml.GetXml();
                if (ourXml.OwnerDocument == null || ourXml.OwnerDocument.DocumentElement == null)
                    throw new InvalidOperationException("This license file is coruppted.");

                using (var reader = new XmlNodeReader(ourXml.OwnerDocument.DocumentElement))
                {
                    var xmlSerializer = new XmlSerializer(typeof(License));
                    return (License)xmlSerializer.Deserialize(reader);
                }
            }
        }

        private static void appendDigitalSignature(XmlDocument xmlDocument, XmlNode xmlDigitalSignature)
        {
            xmlDocument.DocumentElement.AppendChild(xmlDocument.ImportNode(xmlDigitalSignature, true));
        }

        private static XmlDocument createXmlDocument(License licenseData)
        {
            var serializer = new XmlSerializer(licenseData.GetType());
            var sb = new StringBuilder();
            using (var writer = new StringWriter(sb))
            {
                var ns = new XmlSerializerNamespaces(); ns.Add("", "");
                serializer.Serialize(writer, licenseData, ns);
                var doc = new XmlDocument();
                doc.LoadXml(sb.ToString());
                return doc;
            }
        }

        private static XmlElement getXmlDigitalSignature(XmlDocument xmlDocument, AsymmetricAlgorithm key)
        {
            var xml = new SignedXml(xmlDocument) { SigningKey = key };
            var reference = new Reference { Uri = "" };
            reference.AddTransform(new XmlDsigEnvelopedSignatureTransform());
            xml.AddReference(reference);
            xml.ComputeSignature();
            return xml.GetXml();
        }

        private static string xmlDocumentToString(XmlDocument xmlDocument)
        {
            using (var ms = new MemoryStream())
            {
                var settings = new XmlWriterSettings { Indent = true, Encoding = Encoding.UTF8 };
                var xmlWriter = XmlWriter.Create(ms, settings);
                xmlDocument.Save(xmlWriter);
                ms.Position = 0;
                return new StreamReader(ms).ReadToEnd();
            }
        }
    }
}

using System;
using System.IO;

namespace SignedXmlSample
{
    class Program
    {
        static void Main(string[] args)
        {
            //Console.WriteLine(LicenseGenerator.CreateRSAKeyPair());
            writeLicense();            
            readLicense();

            Console.WriteLine("Press a key...");
            Console.ReadKey();
        }

        private static void readLicense()
        {
            var xml = File.ReadAllText("License.xml");
            const string publicKey = @"<RSAKeyValue>
                                    <Modulus>
                                        mBNKFIc/LkMfaXvLlB/+6EujPkx3vBOvLu8jdESDSQLisT8K96RaDMD1ORmdw2XNdMw/6ZBuJjLhoY13qCU9t7biuL3SIxr858oJ1RLM4PKhA/wVDcYnJXmAUuOyxP/vfvb798o6zAC1R2QWuzG+yJQR7bFmbKH0tXF/NOcSgbc=
                                    </Modulus>
                                    <Exponent>
                                        AQAB
                                    </Exponent>
                                 </RSAKeyValue>";

            var result = LicenseGenerator.ReadLicense(publicKey, xml);

            Console.WriteLine(result.Domain);
            Console.WriteLine(result.IssuedTo);
        }

        private static void writeLicense()
        {
            const string rsaData = @"<RSAKeyValue>
                    <Modulus>
                        mBNKFIc/LkMfaXvLlB/+6EujPkx3vBOvLu8jdESDSQLisT8K96RaDMD1ORmdw2XNdMw/6ZBuJjLhoY13qCU9t7biuL3SIxr858oJ1RLM4PKhA/wVDcYnJXmAUuOyxP/vfvb798o6zAC1R2QWuzG+yJQR7bFmbKH0tXF/NOcSgbc=
                    </Modulus>
                    <Exponent>
                        AQAB
                    </Exponent>
                    <P>
                        xwPKN77EcolMTD2O2Csv6k9Y4aen8UBVYjeQ4PtrNGz0Zx6I1MxLEFzRpiKC/Ney3xKg0Icwj0ebAQ04d5+HAQ==
                    </P>
                    <Q>
                        w568t0Xe6OBUfCyAuo7tTv4eLgczHntVLpjjcxdUksdVw7NJtlnOLApJVJ+U6/85Z7Ji+eVhuN91yn04pQkAtw==
                    </Q>
                    <DP>
                        svkEjRdA4WP5uoKNiHdmMshCvUQh8wKRBq/D2aAgq9fj/yxlj0FdrAxc+ZQFyk5MbPH6ry00jVWu3sY95s4PAQ==
                    </DP>
                    <DQ>
                        WcRsIUYk5oSbAGiDohiYeZlPTBvtr101V669IUFhhAGJL8cEWnOXksodoIGimzGBrD5GARrr3yRcL1GLPuCEvQ==
                    </DQ>
                    <InverseQ>
                        wIbuKBZSCioG6MHdT1jxlv6U1+Y3TX9sHED9PqGzWWpVGA+xFJmQUxoFf/SvHzwbBlXnG0DLqUvxEv+BkEid2w==
                    </InverseQ>
                    <D>                        Yk21yWdT1BfXqlw30NyN7qNWNuM/Uvh2eaRkCrhvFTckSucxs7st6qig2/RPIwwfr6yIc/bE/TRO3huQicTpC2W3aXsBI9822OOX4BdWCec2txXpSkbZW24moXu+OSHfAdYoOEN6ocR7tAGykIqENshRO7HvONJsOE5+1kF2GAE=
                    </D>
                  </RSAKeyValue>";

            string data = LicenseGenerator.CreateLicense(
                                                rsaData,
                                                new License
                                                {
                                                     Id = Guid.NewGuid(),
                                                     Domain = "dotnettips.info",
                                                     Expiration = DateTime.Now.AddYears(2),
                                                     IssuedTo = "VahidN",
                                                     Type = LicenseType.Standard
                                                });
            File.WriteAllText("License.xml", data);
        }
    }
}

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