128-bit encryption, no owner password

We have an application that is creating a 128-bit encrypted PDF without user or owner passwords.  When performing a PdfCopy.GetImportPage method call, the GetImportPage method fails in version 4.1.1.0.  This worked in version 3.1.6.0.

The error might stem from the following:

//this is the error being thrown because false is being returend from "IsOpenedWillFullPermissions".

        internal PdfImportedPage GetImportedPage(int pageNumber) {
            if (!reader.IsOpenedWithFullPermissions)
                throw new ArgumentException("PdfReader not opened with owner password");

//this method returns false if encrypted and no password is supplied.

        public bool IsOpenedWithFullPermissions {
            get {
                return !encrypted || ownerPasswordUsed;
            }
        }

//this is the calling code
Snippet one…
     if (reportGuid != Guid.Empty)
     {
        SQLFileInfo inputInfo = new SQLFileInfo(reportGuid);
        using (SQLFileStream inputStream = inputInfo.Open(System.IO.FileMode.Open))
        {
            reader = new PdfReader(inputStream, null);
            if (copy == null)
            {
                doc = new Document(reader.GetPageSizeWithRotation(1));
                copy = new PdfCopy(doc, outputStream);
                doc.Open();
             }
            //copy the pages
             CopyPages(copy, reader);
          }
   }

Snippet two…
        private void CopyPages(PdfCopy copy, PdfReader reader)
        {
            for (int i = 1; i <= reader.NumberOfPages; i++)
            {
                //This is where the error happens
                copy.AddPage(copy.GetImportedPage(reader, i));
            }
        }