Working with clear-text signatures

As of GnuPG release 1.0, there are outstanding issues with respect to passing clear-text signed documents between GnuPG and all versions of PGP. The difficulties appear to be due to implementation deviations from the OpenPGP specification. With respect to PGP 2.x, signatures made by PGP 2.x can be verified using GnuPG and signatures made with GnuPG can be verified using PGP 2.x. The document output from the verification will in both cases differ, however, from the original document. These differences are limited to whitespace, so it should not affect human readability of signed documents. If it is important to maintain complete integrity of the document, you should avoid clear-text signatures.