Index: client/pkgr.eagle
==================================================================
--- client/pkgr.eagle
+++ client/pkgr.eagle
@@ -145,21 +145,21 @@
 
     return false
   }
 
   proc getLookupVarNamePrefix {} {
-    return ::rpkg_; # TODO: Make non-global?
+    return ::pkgr_; # TODO: Make non-global?
   }
 
   proc getLookupVarNameSuffix {} {
     return [appendArgs \
         [string trim [pid] -] _ [string trim [clock seconds] -] _ \
         [string trim [clock clicks -milliseconds] -]]; # TODO: Bad?
   }
 
-  proc getLookupApiKey {} {
-    set varName [appendArgs [getLookupVarNamePrefix] api_key]
+  proc getLookupApiKeys {} {
+    set varName [appendArgs [getLookupVarNamePrefix] api_keys]
 
     if {[info exists $varName]} then {
       return [set $varName]
     }
 
@@ -168,11 +168,11 @@
 
     if {[info exists env($varName)]} then {
       return $env($varName)
     }
 
-    return ""; # NOTE: System default, which is "public".
+    return [list]; # NOTE: System default, which is "public-only".
   }
 
   proc getLookupBaseUri {} {
     set varName [appendArgs [getLookupVarNamePrefix] base_uri]
 
@@ -234,15 +234,22 @@
 
     return $requirement
   }
 
   proc getLookupData { apiKey package version } {
+    variable verboseUriDownload
+
     set uri [getLookupUri $apiKey $package $version]
 
     if {[string length $uri] == 0} then {
       return ""
     }
+
+    if {$verboseUriDownload} then {
+      pkgLog [appendArgs \
+          "attempting to download URI \"" $uri \"...]
+    }
 
     if {[isEagle]} then {
       set data [uri download -inline $uri]
     } else {
       variable quiet
@@ -443,19 +450,19 @@
     #       files created for the script verification process.
     #
     set script(cleanup) {
       if {[string length $fileName(2)] > 0 && \
           [file exists $fileName(2)]} then {
-        if {![info exists ::env(rpkg_keep_files)]} then {
+        if {![info exists ::env(pkgr_keep_files)]} then {
           catch {file delete $fileName(2)}
         }
         unset -nocomplain fileName(2)
       }
 
       if {[string length $fileName(1)] > 0 && \
           [file exists $fileName(1)]} then {
-        if {![info exists ::env(rpkg_keep_files)]} then {
+        if {![info exists ::env(pkgr_keep_files)]} then {
           catch {file delete $fileName(1)}
         }
         unset -nocomplain fileName(1)
       }
     }
@@ -917,23 +924,47 @@
     variable verboseUnknownResult; # DEFAULT: false
 
     if {![info exists verboseUnknownResult]} then {
       set verboseUnknownResult false
     }
+
+    #
+    # NOTE: Emit diagnostic messages when a URI is fetched?
+    #
+    variable verboseUriDownload; # DEFAULT: false
+
+    if {![info exists verboseUriDownload]} then {
+      set verboseUriDownload true
+    }
   }
 
   proc main { package version caller } {
     #
-    # NOTE: Issue the lookup request to the remote package repository.
-    #
-    set data [getLookupData \
-        [getLookupApiKey] $package [getLookupVersion $version]]
-
-    #
-    # NOTE: Attempt to grab the lookup code from the response data.
-    #
-    set code [getLookupCodeFromData $data]
+    # NOTE: Get the list of API keys and try each one, in order, until
+    #       the package is found.
+    #
+    set apiKeys [getLookupApiKeys]; lappend apiKeys ""
+
+    foreach apiKey $apiKeys {
+      #
+      # NOTE: Issue the lookup request to the remote package repository.
+      #
+      set data [getLookupData \
+          $apiKey $package [getLookupVersion $version]]
+
+      #
+      # NOTE: Attempt to grab the lookup code from the response data.
+      #
+      set code [getLookupCodeFromData $data]
+
+      #
+      # NOTE: Did the lookup operation fail?
+      #
+      if {[isLookupCodeOk $code]} then {
+        break
+      }
+    }
 
     #
     # NOTE: Attempt to grab the lookup data from the response data.
     #       Upon failure, this should contain the error message.
     #

Index: client/pkgr.eagle.harpy
==================================================================
--- client/pkgr.eagle.harpy
+++ client/pkgr.eagle.harpy
@@ -19,32 +19,32 @@
 <Certificate xmlns="https://eagle.to/2011/harpy"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <Protocol>None</Protocol>
   <Vendor>Mistachkin Systems</Vendor>
-  <Id>d4dc6ffe-bc7d-4c54-bd96-1da84e25c234</Id>
+  <Id>bfdbe096-dec1-44fd-8613-e85207fd978f</Id>
   <HashAlgorithm>SHA512</HashAlgorithm>
   <EntityType>Script</EntityType>
-  <TimeStamp>2016-08-17T06:17:49.1208516Z</TimeStamp>
+  <TimeStamp>2016-08-17T17:57:27.3230000Z</TimeStamp>
   <Duration>-1.00:00:00</Duration>
   <Key>0x2c322765603b5278</Key>
   <Signature>
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-    RP8TlBZgDW2SZUN832vsCHLJWI6iqSIZBdBSQaaF9OYK9o/GqlvwfT4oZZb6YPj7cRUfugJRtagz
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   </Signature>
 </Certificate>