Both of these issues would likely prevent the protocol from being accepted as an IETF standard as well. This means that they will not require either RSA key exchange or weak cryptography. RFC 2015 is a Proposed Standard in the IETF, but it is not expected to move forwards because it relies on RFC 1991, which requires the use of RSA key exchange, and requires the use of IDEA encryption, both of which are encumbered by patents. Both of these patents would likely prevent the protocol from moving forwards as an IETF standard. However, they differ in many ways, and are not designed to be interoperable.
Some cryptography algorithms are the same between the two protocols, but others differ.
The following chart is a comparison of many relevant features of the two protocols, showing where they differ and where they are the same. They would very much like to see a single standard for secure Internet mail. It has initiated considerable industry discussion about requirements, starting with the Email Security Workshop at the beginning of 1996. IMC has also helped the editors of the OpenPGP drafts. Further, IMC hosts the mailing lists discussing each protocol.