delete(metadata, MetaSealedKeyS3)
	delete(metadata, MetaSealedKeyKMS)
	delete(metadata, MetaKeyID)
	delete(metadata, MetaDataEncryptionKey)
}

// IsSourceEncrypted returns true if the source is encrypted
func IsSourceEncrypted(metadata map[string]string) bool {
	if _, ok := metadata[xhttp.AmzServerSideEncryptionCustomerAlgorithm]; ok {
		return true
	}
	if _, ok := metadata[xhttp.AmzServerSideEncryption]; ok {

		case isDstCompressed:
			targetSize = -1
		case !isSourceEncrypted && !isTargetEncrypted:
			targetSize, _ = srcInfo.GetActualSize()
		case isSourceEncrypted && isTargetEncrypted:
			objInfo := ObjectInfo{Size: actualSize}
			targetSize = objInfo.EncryptedSize()
		case !isSourceEncrypted && isTargetEncrypted:
			targetSize = srcInfo.EncryptedSize()
		case isSourceEncrypted && !isTargetEncrypted: