Media perils liability insurance (or publishers liability insurance) may provide you with protection for such traditional claims as copyright infringement; libel; defamation, plagiarism; invasion or privacy or publicity or infringement of privacy or publicity rights; misappropriation of trademark, title, or slogan; defamation; misappropriation of property rights; personal injury; contextual errors and omissions. What is covered depends on your policy so if there is any chance of your being vulnerable to a lawsuit, study your options. You are protecting mainly against lawsuits, and I am no lawyer, so I report only on what I have learned over the years. I cannot recommend a particular insurance firm or broker, but just finding one is not easy so I list a few. If you don't need the basics explained, scroll down to the section on Where to find liability insurance for authors and indie publishers
Be careful what you agree to in publishing contract
• How to Deal with Warranty and Indemnification Clauses (Writers & Editors site)
• Contract terms (especially but not only in book publishing) '
Media perils and publishers liability insurance, broadly
• Liability Insurance — Nyet (Rich Adin, Business of Editing, An American Editor, 5-22-13). When a client insists that a freelance editor have errors and omissions insurance, what does the editor do? Explain why it makes no sense for editors.
• Get Covered: Media Insurance for Writers (Tara Lynne Groth, Women on Writing, Nov. 2010)
• Media perils insurance protects against lawsuits over libel, copyright infringement (Jennie Phipps, What Freelance Success Says, 5-19-11)
• WriteInsure, through Axis Pro/Argo Insurance Group (media and entertainment liability coverage, professional and miscellaneous errors and omissions, and cyberspace liability). Leading underwriter of media liability insurance. Available through Authors Guild and ASJA, among other organizations. Axis Pro offers four levels of coverage through WriteInsure, ranging from $100,000 per claim (with an aggregate payment limit of $300,000) to $1,000,000 per claim (with an aggregate payment limit of $1,000,000). The program covers legal expenses incurred in defending a claim and any monetary damages or settlements you may be required to pay. The "self-insured retention" (similar to a deductible) ranges from $2,500 to $5,000, depending on the amount of coverage you purchase. See WriteInsure's Frequently Asked Questions (PDF).
• Media Liability Insurance (Authors Guild). The Guild has an agreement with AxisPro to offer its members professional liability insurance (through the insurance brokerage firm, John Buttine, Inc.). Download the FAQ for more details and see application form for Axis Pro's WriteInsure liability policy, for three covered activities: freelance writing (including commentary on third party websites and blogs), book authorship, and/or your own blog.
• SPJ offers access to insurance and financial services through consultants Harry W. Riley III and David N. Brown. Also offers life insurance through MetLife.
• Publiability. Mike Mansell (Granite Insurance Brokers) specializing in media liability insurance for publishers since 1977
• Affordable media liability insurance is available for members of the National Federation of Press Women (through Walterry Insurance Brokers). Walterry appears also to offer Chubb's MediGuard errors and omissions liability insurance for broadcasters and for newspaper publishers.
• AxisPro's Loss Prevention Guide (a loss-prevention guide, this PDF booklet provides basic info on defamation, defamation, invasion of privacy (more complex than you might expect), trademark infringement, and copyright infringement).
• MusicPro Insurance (for instruments and computer equipment)
Comment below if anything useful is missing.