Technically it is. Under the P6 license for example: "You may not sell, distribute, or copyright exported Restricted Content geometry data in any format of any kind unless expressly permitted by this agreement. Re-triangulated, simplified, subdivided, or other Derivative forms of exported geometry data remain Restricted Content." .obj encoding or Rtencoding is usually acceptable as it requires the original meshes to decode. However, that's a community understanding and not written into the Poser license agreement (that I can see)

.