Related Clues:

• Repair books, in a way
• Tricky situation
• Put together, as a book
• Obligate
• Tied down
• Encrypted, perhaps
• Bridge type
• Tie up, as a turkey
• Like an encrypted transmission, in theory
• Tie up or fasten
• Free from danger or risk
• Safe or fastened
• Make safe or fasten
• Tie up or hamper
• Safe, protected