I received a very weird email from an international conference committee, stating that their society (who organised the conference) reviewed the content of my paper and finally decided to exclude it from publication in the proceedings because my ideas did not reflect the society ideas and methods.
This is after they accepted the final edit of my conference paper, about 8 months after the end of a 10 day, very expensive conference. The book they are publishing is not a selection of papers, but the only proceedings which records the facts, topics that were discussed and people that were at the conference.
The paper topics were determined when the initial abstracts were submitted. There were no conditions specified at the time of registration, therefore, as for other general international conferences, registration, acceptance and oral presentation means being part of the proceedings, if not otherwise explicitly specified.
Can my paper and thus the record of my attendance and presentation be excluded from the conference proceedings? Can they discrimate against authors based on the society's views?