diff --git a/sdk/tdf.go b/sdk/tdf.go
index f2efc3f0ae..187d29b69c 100644
--- a/sdk/tdf.go
+++ b/sdk/tdf.go
@@ -51,7 +51,6 @@ const (
 	kAssertionSignature    = "assertionSig"
 	kAssertionHash         = "assertionHash"
 	hexSemverThreshold     = "4.3.0"
-	readActionName         = "read"
 )
 
 // Loads and reads ZTDF files
diff --git a/sdk/tdf_config.go b/sdk/tdf_config.go
index ff9d4c05c9..22e13933a0 100644
--- a/sdk/tdf_config.go
+++ b/sdk/tdf_config.go
@@ -27,10 +27,16 @@ const (
 	inputSizeUnknown = -1
 )
 
+// TDFFormat once selected a manifest serialization. Only JSON was ever
+// implemented, and nothing reads this.
+//
+// Deprecated: unused; the manifest is always JSON.
 type TDFFormat = int
 
 const (
+	// Deprecated: unused; the manifest is always JSON.
 	JSONFormat = iota
+	// Deprecated: never implemented.
 	XMLFormat
 )
 
@@ -68,8 +74,6 @@ type TDFConfig struct {
 	autoconfigure              bool
 	defaultSegmentSize         int64
 	inputSize                  int64
-	enableEncryption           bool
-	tdfFormat                  TDFFormat
 	metaData                   string
 	mimeType                   string
 	integrityAlgorithm         IntegrityAlgorithm
@@ -91,8 +95,6 @@ func newTDFConfig(opt ...TDFOption) (*TDFConfig, error) {
 		autoconfigure:             true,
 		defaultSegmentSize:        defaultSegmentSize,
 		inputSize:                 inputSizeUnknown,
-		enableEncryption:          true,
-		tdfFormat:                 JSONFormat,
 		integrityAlgorithm:        HS256,
 		segmentIntegrityAlgorithm: GMAC,
 		addDefaultAssertion:       false,