Definition
Permissive letters is a term from nineteenth-century international law and naval practice referring to an authorization issued by a government granting a private vessel limited or conditional permission to engage in conduct that would otherwise require formal state sanction — specifically, conduct short of full privateering as licensed by letters of marque. The term suggests an intermediate form of governmental permission: something more than informal tolerance, but less than the complete grant of belligerent rights conferred by letters of marque and reprisal.
The term does not appear to have achieved settled technical status in domestic law. Its single documented usage in American legal sources arises in the context of naval policy during the Civil War, where it was deployed to describe a category of authorization occupying the uncertain space between official state action and private initiative in maritime warfare.
Common Confusion
Permissive letters should not be confused with letters of marque, which are formal constitutional instruments authorizing private vessels to engage in warfare against enemy ships and property, with full recognition under international law. Letters of marque confer belligerent status; permissive letters, as the term was used, apparently conferred something less — a qualified permission without full legal standing under the law of nations. The distinction matters because vessels operating under letters of marque were entitled to treatment as lawful combatants if captured, while those operating under lesser or ambiguous authority risked treatment as pirates.
Why It Matters in Research
This term is a navigational hazard for researchers precisely because it appears so rarely. Its primary recorded use is administrative rather than judicial — arising in an 1861 note by the Secretary of the Navy — which means it will not appear in standard case law searches. Researchers working on Civil War-era maritime history, the law of privateering, or the constitutional dimensions of letters of marque should treat permissive letters as a period-specific administrative coinage rather than a term of art with developed legal doctrine behind it.
The term's appearance in Bouvier's is a cross-reference rather than a definition; Bouvier directs the reader to Halleck's International Law for substance. This is itself a research signal: when a leading nineteenth-century legal dictionary declines to define a term and instead points to a treatise, the term likely had no fixed legal meaning and its content must be reconstructed from the specific context in which it was used.
Researchers studying the law of naval warfare, blockades, or privateering in the American Civil War period should also note that the Union's legal posture on letters of marque was complicated by the fact that issuing such letters to Confederate vessels would have implied recognition of Confederate belligerent status. Permissive letters may reflect an attempt to authorize limited naval action by private parties without triggering those international law consequences. This interpretive layer is entirely absent from Bouvier's entry and requires consulting the primary naval and diplomatic correspondence of the period.
Historical Dictionary Support
Bouvier's is the only major historical legal dictionary to record this term, and its entry is minimal: a single sentence identifying the term as appearing in an 1861 note by the Secretary of the Navy, with a pointer to Halleck's International Law. Bouvier treats the term as descriptive of a practical administrative category rather than as a defined legal concept.
The referenced source — Halleck's International Law in Baker's edition — provides the substantive context that Bouvier omits. Henry Wager Halleck's treatise was a standard American reference on the law of nations in the mid-nineteenth century, and its discussion of letters of marque and related authorizations reflects the international law framework within which permissive letters would have been understood. Researchers should go directly to that treatise rather than relying on Bouvier's summary.
No other historical legal dictionary in the standard shelf — Black's, Stroud's, Wharton's — appears to have taken up the term, which confirms its status as a term of circumstance rather than a term of art.
Jurisdictional Note
This term is effectively confined to federal and international law contexts. It has no apparent footprint in state law. Its relevance today is primarily historical and comparative, arising in research on the law of privateering, the Civil War naval record, or the constitutional limits of executive war powers.
Encyclopedia Cross-Reference
The Law Mind Property Law Encyclopedia: Licenses — Revocable Permission and Distinction from Easements (property_149). Useful background on permission-based authorizations as a legal category, though that entry addresses private property law rather than public international law.
The Law Mind Constitutional Law Encyclopedia: The Privileges or Immunities Clause — Dead Letter or Revival? (constitutional_135). Peripheral relevance only; researchers focused on the constitutional framework for letters of marque will not find direct treatment there.