Step 1: Read the question.
Under the Special Marriage Act, 1954, we must find the maximum fine for printing or publishing matter against the rules on in-camera (closed door) proceedings.
Step 2: Understand in-camera proceedings.
Matrimonial cases often have very private and personal facts. To protect the dignity of the parties, the court may hear the case in camera, that is, behind closed doors.
Step 3: Know the protection.
The law does not allow anyone to print or publish details of such closed proceedings without permission.
Step 4: Find the penalty.
The Special Marriage Act says a person who breaks this rule can be fined. The maximum fine fixed is one thousand rupees.
Step 5: Check the other options.
Five thousand, two thousand and five hundred rupees do not match the figure in the Act. Only one thousand rupees is correct.
Step 6: Final answer.
So the highest fine is one thousand rupees.
\[ \boxed{\text{Fine up to one thousand rupees}} \]